agree - alwys take the pain relief!!
big knickers - go to primark or somewhere else where they are as cheap so you don't feel dreadful about just binning them.
lots of maternity pads
polos for the trapped wind
arnica - whoever said they took it beforehand I totally second that - start taking it a few weeks before your section and then on the day before and the day take one pillule every 30 mins - it gives a great boost and really aids healing
bottle of champagne - surprisingly with second section (frist was emergency) i completely bought into the whole idea. just a sip though!
nice chocolate
some prepared good food - M&S salads etc so you ahve soemthing decent to eat - a lot of recovery units aren't allowed to do toast now for elf & safety so decent food is a must
camera (black & white pref) or dvd camera - don't record the whole thing but the very last minute and then dc being sorted out and given to you / dh / dp is amazing to get - and then you can always remember what song the dc was born to
lip balm
cleaning wipes - pn wards are notoriously grubby especially in the shower etc
flipflops to wear in said shower
wrap dresses are great for bfing and also for afterwards with your big knickers
and do the stairs - even if it's just a few the first time you're up keep going - the more very gentle exercise you do the sooner you heal.
good luck - will look forward to seeing your birth announcement